Figure 3.

A colorized matrix of the pitfall trap design variables recorded from the 60 research papers. “Not stated” and “Not applicable” values are shown in black (“NS”). The darker colors represent higher values (e.g., larger diameter in mm). All values were transformed prior to plotting (log_e + 1). The volume of the trap and the volume of killing preservative used were less frequently reported than the diameter and depth of the pitfall trap. Several studies in the 2014 year class did not report the trap diameter, depth, volume, or killing‐preservative volume used. The key interpretation point for these figures is that if methodological variation was zero (and reporting complete) between researchers, the figure would be of a uniform color.